JPH1077151A - Paper sheet reversing device used particularly in printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reversing device by which trouble is hardly caused and which can be operated with high reliability and does not damage a reversing paper sheet. SOLUTION: A reversing device is provided with first guide means 21 and 22 to guide a paper sheet in the first direction A along a supply passage, rotary member systems 2 and 3 which are arranged on its downstream side and constitute a nipping means for carrying and second guide means 6, 7 and 8 to guide the paper sheet along a discharge passage 23 different from the supply passage 21 in the fourth direction having a third directional component, and is provided with a rotary member 3 directly driven so as to selectively drive the paper sheet in the second directions B and C having a first directional component and the third direction opposite to them by selectively driving the rotary member systems 2 and 3 in two rotational directions, and is also provided with an actuating means 20 which removes the second guide means from an actuating position and sets them in the actuating position so that the paper sheet can be carried in the second directions and the third direction by actuating the second guide means 6, 7 and 8 when a driving device is actuated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper sheet reversing device intended to be incorporated in a printing apparatus having a scanner, such as a scanner / printer or a copying machine.

[0002]

2. Description of the Prior Art Apparatus for reversing a paper sheet are known. U.S. Pat. No. 4,456,236 describes a reversing device used to enable the use of double-sided paper sheets. In this reversing device, after the paper sheet is taken in by the scanner, the back surface is taken in by the scanner via the loop guide. A roller device rotatable in both directions is located immediately downstream of the scanner. The deflection structure is provided between the roller system and the scanner, and is constituted by an elongated guide member. The guide member constitutes a paper sheet guide at a first portion of the loop reversal path,
The end, which is rotatably arranged around a fixed pin and is suspended downward, constitutes the actual deflector. This suspended end is usually one-sided paper sheet by gravity.
It is scanned a second time and extends into the path it takes after being fed through the scissors. The paper sheet pushes the hanging end of the guide section from the corresponding path. After the trailing edge of the paper sheet has passed the suspended end of the guide, this end again descends under the influence of gravity. Next, the drive roller is rotated in the reverse direction, and the trailing edge of the paper sheet becomes the leading edge.
This leading edge extends above the hanging end of the guide portion, and is pushed obliquely downward by the guide portion,
Pass through a loop path.

[0003]

The above-mentioned known reversing device operates by the product itself to be processed and the weight of the guide portion. As a result, the reliability of this known device is not always sufficient, and there is a high risk of paper sheet jams, so that troubles are likely to occur. SUMMARY OF THE INVENTION An object of the present invention is to provide a paper sheet reversing device which can be operated with high reliability without causing trouble and which does not damage the reversing paper sheet at all, especially in a printing device such as a printer or a copying machine. It is to provide a device.

[0004]

SUMMARY OF THE INVENTION To this end, the present invention is directed to a paper sheet reversing device, particularly incorporated in a printing device such as a printer or copier, which supplies one or more paper sheets. A first guide means for guiding the paper sheet along the path in a first direction, a rotating member system disposed downstream of the first guide means and constituting a transport scissor, and a fourth member having a component in the third direction for transporting the paper sheet in a third direction A second guide means for guiding the paper sheet along a discharge path different from the supply path in the direction, wherein the rotating member system is selectively driven in two rotational directions to respectively move the paper sheet into the first direction. At least one directly driven rotating member adapted to selectively drive in a second direction having a directional component and a third direction opposite thereto, and during operation of the drive, Activating the second guide means, the paper sheet Provided is a paper sheet reversing device further provided with an operating means for removing the second guide means from an operating position and setting the second guiding means to the operating position so that the paper sheet is conveyed in the second direction and the third direction, respectively. .

In the reversing device according to the invention, the second guide means required to guide the paper sheet or the stack of paper sheets in the opposite direction is installed in its operating position by an additional operating means, And is removed from the operating position. As a result, the reversing device is independent of the paper thickness in its operation and can function reliably over a long period of time.

In a further refinement of the reversing device according to the invention, the actuating means is provided on the rotating shaft of one of the rotating members, preferably on the drive shaft. This eliminates the need for a complex and large transmission mechanism. In this connection,
Preferably, the second guide means comprises a guide surface formed at an inclined means at least partially upstream of the transport scissors with respect to the second direction and pivotally disposed about the point. The guide surface is located below a horizontal plane passing through the transport scissors in the inoperative position. In this case, gravity is used to move and temporarily hold the guide surface to the most frequently required inactive position.

[0007] Preferably, the pivot point is located below a horizontal plane passing through the transport scissor passage. The tilting means is therefore held outside the transport scissors and completely below it, so that the path of the paper sheet is not obstructed and the construction of the reversing device is simplified. Preferably, the tilting means comprises flap means and the pivot point is located downstream of the transport scissors with respect to the second direction. For this purpose, the guide surface and the pivot point are arranged on both sides of the driven rotary member, so that only a limited space is required in the processing direction.

Preferably, the operating means includes a lifting means for temporarily lifting the flap means against gravity when the second guide means is set in the operating position and temporarily held. Preferably, the lifting means comprises at least one cam provided on the shaft and provided with a support surface for the flap means. The support surface includes first and second support surface portions disposed at different radial distances from a centerline of the shaft.

Preferably, the first support surface is a cylindrical surface concentric with the shaft, and the second support surface is closer to the shaft than the first support surface, the first support surface in the second direction. Is provided on the upstream side. In the non-actuated position, the flap means can be supported at a predetermined distance from the scissors such that the drive direction is reversed and lifted when the cam rotation direction is reversed, and vice versa.

[0010] Preferably, the first support surface has a radius substantially the same as the radius of the rotating member of the shaft. Preferably, the second support surface part forms part of a plane extending tangentially to the shaft. According to a further refinement of the reversing device according to the invention, the cam is provided on the shaft by a frictional or sliding connection. In this case, the reversing device includes stationary stop means, and the first and second abutment means are fixed to the cam so as to oppose each other in the rotation direction of the shaft and to be separated in this direction. The stop means is disposed in the rotation path of the first and second contact means. When the driving direction of the rotating member is reversed, the cam rotates by frictional connection until the stop means comes into contact with one of the contact means. Then, the cam stops at that rotational position, while the drive rotary member continues to rotate. When the driving direction is reversed again, the same situation occurs in the opposite direction.

Preferably, in order to achieve a frictional connection between the cam and the drive shaft, the cam has a substantially annular shape with a continuous radial recess and is made of an elastic material such as rubber. . The cam is clamped around the shaft,
The stop means extends inside the recess. The first and second abutment means each comprise an abutment surface, the normals of which have a tangentially or radially inward component. In this case, when the cam comes into contact with the stop means and tries to continue rotation by engaging with the shaft, the contact means pushes out the cam, thereby largely eliminating the frictional connection between the cam and the shaft. Thus, the shaft and the rotating body can continue rotating with little or no obstacle.

The present invention also relates to a printing device provided with the reversing device according to the present invention.

[0013]

Embodiments of the present invention will be described below with reference to the accompanying drawings. 1 to 4 show four successive stages of operation of an embodiment of the reversing device according to the invention. In FIG. 1, a reversing device 1 is disposed behind a scanner 100 of a copying machine. The document sheet P is read by the scanner 100. The reversing device 1 is configured to remove the read document from the side where the document is supplied to the scanner, for example, in order to reversely supply the back surface of the double-sided document sheet P to the scanner 100. In the case of a double-sided document, the paper sheet P can be returned to the direction F (see FIG. 4) so that the paper sheet P is again supplied to the scanner 100 while being inverted by a loop path (not shown).

In the first direction A, the scanner 100
A guide means, which is a guide plate 21, is disposed at the rear of the camera. Above the guide plate 21, a reversing guide 22 having an inclined guide surface 23 starting from a nose 27 is provided. A set of drive rollers 2 and 3 constituting scissors is provided apart from this. Rollers 2 and 3 are provided on shafts 4 and 5, respectively. Shafts 4, 5
Is driven by a driving unit (not shown). It will be clear that the rollers 2, 3 can also consist of a number of rollers arranged axially adjacent to one another. Rollers 2 and 3 are controllably driven and can be selectively rotated in both I and J directions.

A deflection flap 6 is disposed below the scissors. The deflection flap 6 is pivotally supported at the position of the fixed pin 8 downstream of the rollers 2 and 3. A support surface 9 is provided on the bottom surface of the deflection flap 6, and a guide surface 7 is provided on the upper surface. In the position shown in FIG. 1, the deflection flap 6 is located completely below the horizontal plane passing through the scissors of the rollers 2,3. For this reason, in the transport direction A, which is most frequently required (always required even for a one-sided original), the deflection flap 6 is in a non-operating state and does not constitute an obstacle. In contrast to the conditions imposed on the guide surface 7, the support surface 9 does not need to vertically coincide with the path followed by the paper sheet P. It will be clear that the connection between the guide surface 7 and the hinge pin 8 can be made in various ways.

On the support surface 9, a rubber cam 10 is provided on the (drive) shaft 5 of the roller 3. Cam 10
Is clamped so that its inner peripheral surface 12 surrounds the outer peripheral surface of the drive shaft 5. The cam 10 has cylindrical surfaces 15, 1
6 are provided. A support surface 11 extending in a tangential direction is provided between the cylindrical surfaces 15 and 16. Support surface 11
Is connected to surface 15 at end edge 26. The cam 10 is formed in an open ring shape, and the continuous radial recess 24 is defined by contact surfaces 13 and 14 extending in the radial direction.

The stop member 20 fixed to the reversing device 1 by means not shown extends axially inside the concave portion 24. The reversing device 1 operates as follows. When the sheet is conveyed past the scanner 100, the rollers 2 and 3
Rotates in the direction I. Due to the friction between the inner surface 12 of the cam 10 and the rotating shaft 5, the cam 10 rotates together, and the contact surface 13 is pressed against the pin 20. As a result, when the force G acts on the rubber cam 10, the cam 10 is somewhat pushed apart and the frictional force acting on the rotating shaft 5 from the inner surface 12 is largely canceled.

In the situation shown in FIG. 1, the deflector 6 is located completely below the horizontal plane passing through the scissors of the rollers 2 and 3. In such a situation, the support surface 9 of the deflection flap 6 is stably seated on the flat support surface 11 of the cam 10.
In such a situation, the paper sheet P is transported in the first direction A and further passed through the rollers 2 and 3 in the second transport direction B
(In this case, it is transported in the transport direction A)
It is bent downward in the direction C in the front region.

When the rear area of the paper sheet P reaches the scissors, the rollers 2 and 3 are stopped. Next, the rotation directions of the rollers 2 and 3 are reversed, so that the rollers rotate in the direction J, and the actual transport direction of the scissors becomes the direction D. In the reversed rotation direction, the cam 10 is disengaged from the stopper member 20, and the inner surface 12 thereof can be tightly fitted with the shaft 5 again. This mutual engagement is
When the cam 10 tries to rotate in the counterclockwise direction, it is strengthened by the force acting on the cam 10 from the support surface 9 of the deflection flap 6. As a result, the co-rotation of the cam 10 in the direction J is promoted, and the support surface 11 rotates downward so as to separate from the support surface 9. First, the end surface 26 that forms the transition between the support surface 11 and the cylindrical support surface 15 is engaged with the support surface 9, so that the cylindrical surface 15 is completely engaged with the support surface 9 until the cylindrical surface 15 is completely engaged with the support surface 9. Is lifted, and the orientation of the deflection flap 6 is stably maintained. When the other contact surface 14 of the cam 10 reaches the other side of the stopper member 20, continuous rotation of the cam 10 in the direction J is prevented. In response, the stop member 20 exerts a force in the direction H on the contact surface 14 so that the cam 10 spreads somewhat, as in FIG. 1, and further rotation of the shaft 5 and the roller 3 is almost impossible. Not disturbed.

The rear area of the paper sheet P includes rollers 2 and 3
Is returned in the fourth direction E. However, since the deflection flap 6 is inclined, the rear area of the paper sheet P is held above the nose 27 located at the end of the supply path. Therefore, the paper sheet P is supported by the guide surface 23 and is conveyed obliquely upward in the direction F.

When the paper sheet P is completely separated from the scissors,
The direction of rotation of the rollers 2 and 3 is again set to the direction I.
For this reason, the force H acting on the contact surface 14 of the cam 10 is eliminated, the cam 10 engages with the shaft 5, the contact surface 13 reaches the stop member 20 again, and the support surface 11 is shown in FIG. It rotates around until it returns to the position. Under the influence of gravity, the deflection flap 6 automatically returns to the position shown in FIG. 1, and the next paper sheet P can move toward the scissors without being disturbed.

[Brief description of the drawings]

FIG. 1 shows a first operating stage of an embodiment of the reversing device according to the invention.

FIG. 2 shows a second operation stage of the reversing device of the embodiment.

FIG. 3 shows a third operation stage of the reversing device of the embodiment.

FIG. 4 shows a fourth operation stage of the reversing device of the embodiment.

[Explanation of symbols]

 2, 3 roller 5 drive shaft 6 deflection flap 7 guide surface 8 fixing pin 10 cam 11 support surface 13, 14 abutment surface 15, 16 cylindrical surface 20 stop member 21 guide plate

Claims (17)

[Claims] 1. A paper sheet reversing device incorporated in a printing device such as a printer or a copying machine, and guides one or more paper sheets in a first direction (A) along a supply path. The first guide means (21, 2
2), a rotating member system (2, 3) disposed downstream thereof and forming a transport scissor, and a paper sheet in a fourth direction (E) having a component in a third direction (D). A discharge path (2) different from the supply path (21)
Second guide means (6, 7,
8), wherein the rotating member systems (2, 3) are selectively driven in two rotation directions to respectively move the paper sheet in a first direction (A).
At least one directly driven rotating member (3) adapted to be selectively driven in a second direction (B, C) having a component and a third direction (D) opposite thereto. ), Wherein the second guide means (6, 7,
8) Activate the paper sheet in the second direction (B, C)
And the operating means (10, 2) for removing the second guide means (6, 7, 8) from the operating position and setting the second guiding means (6, 7, 8) to the operating position so as to be conveyed in the third direction (D), respectively.
Paper sheet reversing device further comprising 0). 2. The actuating means (10, 20) comprises a rotating shaft (12) of one of the rotating members (2, 3), preferably a drive shaft (1) of a driven rotating member (3).
2. The paper sheet reversing device according to claim 1, which is provided in 2). 3. The second guide means (6, 7, 8).
Is a guide formed at an inclining means (6) arranged at least partially upstream of said transport scissors with respect to said second direction (B, C) and pivotally provided around a point (8). The paper sheet reversing device according to claim 2, comprising a surface (7), wherein the guide surface (7) is located below a horizontal plane passing through the transport scissors in the inoperative position. 4. The paper sheet reversing device according to claim 3, wherein the turning point is disposed below a horizontal plane passing through the transport scissors. 5. The inclining means comprises flap means,
The paper sheet reversing device according to claim 3 or 4, wherein the turning point (8) is arranged downstream of the transport scissors in the second direction (B, C). 6. The operating means (10, 20) causes the flap means (6) to gravity when the second guide means (6, 7) is set to the operating position and temporarily held. Lifting means (10, 1
The paper sheet reversing device according to claim 3, 4 or 5, further comprising (1). 7. The shaft (1)
2) comprising at least one cam (10) provided at 2) and having a support surface (11, 15, 16) for said flap means (6), said support surface having a different diameter from the center line of said shaft (12). The first support surface portions (15, 1
7. A paper sheet reversing device according to claim 6, comprising: (6) and a second support surface (11). 8. The first support surface (15, 16) has a cylindrical shape concentric with the shaft (12), and the second support surface (11) has a first support surface (15, 16). 1
8) closer to the shaft (12) than to (6), and arranged upstream of the first support surface (15, 16) in the second direction (B, C).
A paper sheet reversing device as described in the above. 9. The first support surface portion (15, 16),
9. A paper sheet reversing device according to claim 8, wherein the radius of the surface of the rotating member (3) corresponding to the shaft (12) is substantially the same. 10. The paper sheet reversing device according to claim 9, wherein the second support surface portion (11) forms a part of a plane extending in a tangential direction of the shaft (12). 11. The paper sheet reversing device according to claim 7, wherein the cam (10) is provided on the shaft (12) by a frictional connection or a sliding connection. 12. A stationary stop means (20), wherein the cam (10) is fixed to the cam and faces in the opposite direction of rotation of the shaft (12) and is spaced apart from each other in the direction. And a second abutment means (13, 14), wherein said stop means (20) is arranged in a rotational path of said first and second abutment means (13, 14). Paper sheet reversing device. 13. The cam (10) is a substantially annular member having a continuous radial recess (24), wherein the cam (10) is made of an elastic material such as rubber and the shaft. The stopper means (20) extends inside the recess (24), and the first and second contact means are respectively provided with contact surfaces (13,
14), wherein the perpendicular of said tangent surface (13, 14) has a tangentially oriented or radially inward component.
3. The paper sheet reversing device according to 2. 14. The paper sheet reversing device according to claim 3, wherein the guide surface (7) is arranged in the operating position in a plane passing through the transport scissors. 15. The rotating member system is a roller system (2, 3).
The paper sheet reversing device according to any one of claims 1 to 14, wherein: 16. A printing apparatus comprising the paper sheet reversing device according to claim 1. Description: 17. A copying machine comprising a scanner and a paper sheet reversing device according to claim 1 disposed downstream thereof.